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Questions tagged [power]

Power is the ability to supply a device with energy. This question covers how to power the Pi, ways to do it, and the safe ranges of power.

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L293B unable to deliver power to dc motors on Raspberry Pi 3B+

I have a problem delivering power to 2 dc motors using L293B on Raspberry Pi3B+ I run the following code: GPIO.setmode(GPIO.BOARD) GPIO.setup(11, GPIO.OUT)#To L239 Pin2 GPIO.setup(12, GPIO.OUT) #To ...
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Pi 3B, 2 Servos and 2 Ultrasonic sensors. Power Supply needed

So right now I have the following items in front of me: Raspberry Pi Model 3B The power cable / plug that comes with it 2x MG995 Servo motors (<- open short compact datasheet for voltage info) 2x ...
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1answer
20 views

GPIO solution to power Pi

Looking for a GPIO solution to power a Pi 3 B+. Basically, trying to bypass the Pi micro USB connector. Also, any suggestions on hardware to build a compact, inverted, USB male right-angle ribbon ...
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2answers
58 views

Raspberry Pi with USB 3 (or 3.1) and enough power to use 2 drives

I bought a new camera which writes a lot of data onto SSDs, which I then would like to transfer onto HDDs. I thought about using a Raspberry Pi, but I was told it doesn't have enough power for a ssd ...
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1answer
15 views

Lipo power: Powerboost versus Micro-Lipo charger

I'm a hardware newbie, wanting to power my RPi Zero via a Lipo battery, and also have the battery charge without removing it. There are many posts about this, but my question is more about two power ...
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2answers
93 views

Driving an 8 Ohm, 0.25 W speaker using GPIO or audio output (RPi 1 Model B)

I'm trying to build a Raspberry Pi into an old toy phone and use the GPIO pins to read the numeric pad (this part is working) and attaching the RPi's output to the built-in speaker. The speaker says "...
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1answer
38 views

USB Hub suitable for powering a RPi 3 b+ and multiple usb sticks?

I was wondering if it was possible to power a raspberry pi 3 b+ and a dozen usb 3.0 sticks, or if not, what would be the best recommended way to go about this, ideally i'm looking for an off the shelf ...
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1answer
47 views

Can I give power 5V 2.1A to Raspberry Pi 3 B+?

I have already taken RPI 3 B + from post office and now I want start RPI 3 B +. But I'm seeing that I haven't got 5V 2.5A Power Block. So, I have a question. Can I give power 5V 2.1A to Raspberry Pi 3 ...
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2answers
133 views

read only Raspbian and microSD partitioning

is it true that if I set Raspbian as read only I can prevent any microSD corruption due to power faults, so that I can simply unplug the battery instead of the clean "Menu > Shutdown"? if it is true ...
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1answer
36 views

Is it safe to power pi 3 via gpio via ttl cable?

I hope my question makes sense. I just pruchased a dsd-tech usb to ttl adapter (cp2102 based). It has 3.3v and 5v pins. Is it safe to use the 5 pin to power my pi3 or should i go through micro usb as ...
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1answer
55 views

Detecting when a UPS kicks in

So, this is probably a matter of buying the right UPS but I am currently using a Pi to control my aquarium via relays. I'd like to hook the whole system to a UPS in case of powerloss. Ideally, I'd ...
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2answers
58 views

Can I program my Pi to keep track of its own power usage?

I'm doing a university project using a raspberry pi 3 using , and I'm essentially making a time lapse camera. I have the camera module, and I've managed to take some pictures, but it would be good for ...
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1answer
46 views

Pi Power Distribution - how much needed

I was using my Pi (1 model B+) in order to create a remote controlled car (Another question I have about that I posted). The issue is that when I connected the 9v battery to power my wheels, it ...
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0answers
38 views

How can I check power consumption of Raspberry Pi 3?

I want to check how much power is consumed by an individual program on a Raspberry Pi 3. When I searched this, I found a way using external power measuring equipment, but unfortunately, I don't have ...
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1answer
31 views

Power from Pi 3 to 7" display

Does the 3v3 carried in the FFC cable at the display header of the Pi 3 B+ supply power to the 7" touch display? Or do I need to supply power at J1.1 and .5? If so this power can be pulled from the ...
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0answers
74 views

How to determine power draw (lightning bolt question)

I have the Raspberry Pi 3 to use for RetroPie and I was plugging my cable into the TV and getting this thunder bolt symbol and eventually I started up and my whole install was corrupted. I discovered ...
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0answers
21 views

Turning off power to usb ports for a joystick

I have 2 joysticks + 1 keyboard connected to a Raspberry PI 3B+ running the latest emulation station, and I'm looking for a solution to be able to turn off one or more of these devices from software (...
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2answers
26 views

When under load, the system is unresponsive except for a ping

I've got a Raspberry Pi 1 Model B that has been my trusty workhorse for a few years. It normally chugs away happily running transmission, pi-hole and a node.js app simultaneously. All of a sudden it'...
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2answers
37 views

Restore UART pins 8 & 10 after GPIO.cleanup() without reboot

A Raspberry Pi 3B+ is talking to an STM32 chip via UART over pins 8 (TXD) & 10 (RXD). When I take control of those pins using GPIO.setup(8, GPIO.OUTPUT); GPIO.output(8, GPIO.LOW); and later ...
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1answer
41 views

Pi 3 and SainSmart 8 channel SSR - Not able to turn on all 8 relays

Pi 3 and SainSmart 8 channel SSR - Not able to turn on all 8 relays Environment: Raspberry Pi 3 OS: Raspian Language: Python3 and Java/Pi4J Control: SainSmart 8 channel Solid State Relay Issue: ...
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1answer
34 views

Is splitting a wire off of a single 5V pin the same as using two 5V pins? [duplicate]

In other words, is two 5V pins plugged into two pins on another device (say a 16x2 LCD display) different or the same as using one 5V pin on the pi and splitting it to two pins on the LCD? For more ...
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2answers
90 views

Is it safe to use this battery with the Raspberry Pi Zero?

I have two questions actually: 1) is it safe to use this battery and these wires with the raspberry pi zero? 2) if yes, where do i solder the highlighted (red square) ends to the zero board?
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0answers
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Automatically restart Raspberry Pi on Shutdown

I'm currently using a Raspberry Pi 3 B+ at a remote location and use a VPN and SSH to access the device. If the power unexpectedly goes out at this remote location (or more commonly I stupidly ...
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2answers
75 views

Powering Raspberry Pi 3 + Official Display with anker switch power bank

There are a ton of questions posted similar to this but not quite this from what I had found, and I'm looking to understand this a bit more. I have a Raspberry Pi 3 as well as the official 7" display....
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27 views

RPi3 Touchscreen white fade reboot

I have an RPi3 with the 7in touchscreen attached. Sometimes when I boot up, it runs through the startup procedure, then at some point (it varies, has happened right near the beginning after the ...
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2answers
54 views

Can I power a raspberry pi and motor hat from the same source?

I have a raspberry pi 3 and an Adafruit motor hat. The motor hat is powered from a 24v wall plug adapter while the pi is powered from a 5v one. I'd like to save a wall outlet and cleanup the wires (...
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1answer
180 views

Raspberry Pi with 12V solenoid and 5V relay module

I want to connect and control a 12V door lock solenoid and am a bit unsure about the circuit. So far I've bought following components in: Raspberry Pi 3 Model B 4x18650 Battery Holder 4x18650 (3.7V)...
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1answer
152 views

Pi 2B, Under-voltage detected!, no lightening bolt, +5 is rock solid at 5.01VDC

This is a weird one - have had 2B in service for three years, but it crashed last week. Rebuilt with a new Pi 2B+, but saw undervolt errors on the rebuilt system that would have gone unnoticed, so ...
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1answer
137 views

How to power Raspberry Pi from a lab power supply via USB?

How can a Raspberry Pi be powered from a lab power supply via USB? I have a lab power supply that can easily output 5 V/4 A and I would like to use it to power a Raspberry Pi (version 3B and 3B+). ...
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1answer
127 views

How long to wait after shutdown to cut power

I am working a problem that seems to be fairly popular with the Raspberry Pi community. In essence, I am designing a circuit that will utilize a DS3231, a 555 timer, and a load switch to cut power ...
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1answer
29 views

Powering One Raspberry Pi Zero from Another

I'm trying to create a portable solution where two Pi Zeros are each running a camera module. I was thinking that I would use a single phone power bank. Is it advisable/possible to take 5 volts from ...
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2answers
248 views

Raspberry Pi 3 Model B (not B+) USB polyfuse location

Usual problem - USB power has gone. Where is the fuse located on the board? The reduced schematics on the RPi webpage does not show the USB at all.
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1answer
45 views

Prevent Pi Zero W from turning on after receiving power

My Pi Zero is powered by a small ATX PC power supply that is also powering a few other components: projector, audio amplifier. I'm using the gpio-shutdown device tree overlay to add a power button on ...
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2answers
345 views

Powering a sensor using an external power supply board

In my Raspberry Pi project, I need to measure a distance. To do that, I have an ultrasound sensor called "AJ-SR04M" (it is basically a waterproof HC-SR04 I believe). Characteristics of the AJ-SR04M: ...
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2answers
129 views

Do I need a resistor to wire my Pi Zero directly to a power source?

I want to connect my Pi Zero directly to a 5V 10amp power adapter (shown below) which in turn connects to a wall outlet. I know that with LEDs you can't just connect it directly to the power source ...
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1answer
171 views

Pi shuts down every day at 11:23 PM

I have a Pi Zero W running Raspbian Stretch Lite (June 2018). I'm using it to turn the crank on an automatic cat feeder. I've barely changed the base configuration: apt-get-installed git and samba, ...
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1answer
64 views

Everything is dead, but Pi 3B still boots

I left my Pi 3B (V1.2) alone, running a 64-bit build of Debian for a project. Everything was fine. When I returned, however, I found that everything was dead. Nothing was connected to it, by the way. ...
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2answers
101 views

Overcurrent protection

Are there any over-current protection measures on RPis? Either on GPIO or power supply pins. Are there differences between versions? Unfortunately two of my 3b+ boards are dead now because of brief ...
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1answer
73 views

Is it okay to power the Pi Touchscreen by plugging into the Pi?

I have the official raspberry Pi 7 inch touch screen, and I have mounted to it a Pi 2. Lately I have been using it and I have been plugging the power into the Pi itself. I however recently remember ...
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0answers
54 views

CM3 power-up - 3V3, 1V8 sequencing

We are developing a high volume product using a lot of CM3s and we're looking into some power-up sequencing issues. I found the following on one of the forums from 2014 (I assume it refers to the CM1)....
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1answer
93 views

Energy consumption measurement using ACS current sensor [closed]

I want to build an energy consumption meter using my Raspberry Pi. I have done some research, and determined that the ACS712 current sensor could be interfaced with my RPi for this purpose. I do not ...
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1answer
178 views

Speaker for Pi Zero W

I'm looking for speaker without battery. I mean I need a speaker whose power can be supplied by raspberry pi zero w. I think I can use USB 2.0 simple speaker. I can cut its usb cable and connect its ...
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2answers
132 views

I have a Raspberry Pi 3B+, I'm running it from a 3.3A 24V LED Driver (Through a Buck Converter). I have a question about the PWR (Red) LED

I'm running a Raspberry Pi 3B+ on a 24V 3.3Amp LED Driver. I'm converting the 24V to 5.1V for the Pi using an MP1584EN DC-DC Buck Converter with a rated output current of 3Amp. I power the Pi though ...
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0answers
31 views

Is it possible to use 3.3v pin as usual GPIO for general purposes? [closed]

Need 6 pins one after another, but can't imagine where I can get them. Any ideas?
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1answer
38 views

Using Raspberry in Nanosatellite [closed]

I want to use raspberry pi in space projects like cubesats. I worry about effects of space radiation on raspberry.Is this possible to do?or i need to choose another board or something like that?
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2answers
34 views

Raspberry Pi Zero W not responding

I bought it about a year ago and a few days ago I plugged it into my Mac with a micro USB. I did make the mistake of plugging into the USB port initially but it did respond. For a while it worked i:e ...
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2answers
1k views

Raspberry Pi 3B+ RTC and Power ON button

I have a RTC DS3231 connected to my Raspberry Pi 3 B+. I connected it using this tutorial https://www.raspberrypi-spy.co.uk/2015/05/adding-a-ds3231-real-time-clock-to-the-raspberry-pi/ and everything ...
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1answer
193 views

3B+ won't boot after measuring at GPIOs - red LED on constantly

Today, I've experienced kernel panics every time I'd execute a certain python script. I was a little bit surprised, since I've executed more heavy scripts before, but doing my research, I found out, ...
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0answers
29 views

How to fix my Raspberry Pi 3 b1.2 - No red or green LED?

I went to start it up one day and it will not start up. There are no red or green LEDs. The power cord works but the Pi does not work. Please help me.
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1answer
82 views

Cooling fan causes shutdown

I'm using Raspberry Pi 3 with 5V/2.5A input. I'm going to do heavy work with Rasp (so need to cool CPU). Today I bought 5 V mini fan for my Raspberry and plugged to GPIO pins 4 and 6. While ...